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Check the #7 spark plug and coil, also the fuel injector, make sure its clean and it's connections are good. An easy way to check the coil is to switch it out with another cylinder or buy one new and see if it makes the difference. The same for the spark plug, if neither one of these items makes the difference look to the injector.

Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.